Portable back wall for open-hearth furnaces



J. 0. amass.

PORTABLE BACK WALL FOR OPEN HEARTH FURNACES.

APPLICATION FILED NOV. 24, I919.

Patented May 3, 1921.

UNITED, STATES JOHN O. GRIGGS, OF YOUNGSTOWN, OHIO.

PORTABLE BACK WAL ron OPEN-HEARTH FURNACES.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed November 24, 1919. Serial No. 340,234.

. To all whom it may concern! to portable back walls, and it is in the nature of an improvement on the back walls shown and described in my prior applications, Serial No. 259,683 filed October 25, 1918, and Serial No. 301,257, filed June 2, 1919, to which reference is made herein. The advantages of portable furnace back walls have been fully set in said applications, and one of the objects of this invention is to protect the marginal edge of the frame or support for the refractory material of the back wall from the intense heat developed in the furnace. Another object is to provide simple and efficient means for keying or securely fastening the refractory material in place in the frame or water jacket without the aid of additional securing means, other than the frame or water jacket and refractory material, the two, when assembled, cooperating to positively bind the refractory material in the frame.

Other ob'ects and advantages will appear from the ollowing specification and with all of said objects and advantages in view, this invention consists in the several novel features hereinafter fully set forth and claimed.

The invention is clearly illustrated in the accompanying drawing, in which- Fi re 1 is a vertical cross section taken through the back of an open hearth furnace and illustrating a simple embodiment of the presentinvention. Fig. 2 is a side elevation of a portable back. wall section, looking from the interior of the furnace, a part of the refractory material being broken away to show the frame which supports it. Fig. 3 is a perspective view of one of the marginal blocks or bricks which form the keying or securing means, and Fig. 4 is a perspective view of one of the corner blocks or bricks. 1

Referring to said drawing, which illustrates a simple embodiment of the present invention, the reference character A designates the stationary portion of the back wall of an open hearth furnace of ordinary and well known construction, I, the arch or roof, and C one of the buck stays. The buck stays are arranged in groups and the groups are spaced apart and connected at their upper ends by bars or beams E, as is well known. A skew back channel iron beam J reinforces the arch or roof at the places where it rises from the back wall.

As in my prior applications above referred to, a portable back wall F may be used with the ordinary furnace to act as a temporary back wall, after the'original back wall has fallen in and while it is being rebuilt, or the portable back-wall may be used as a substitute for the usual back wall, or the furnace may be so built as to employ the portable back wall, as a part of the original structure. In the embodiment of the invention, as illustrated, the portable back wall F is shown as suspended from the channel iron beams E, by rods, one of which is shown at G, which rods engage with lugs 11 on the outer faces of the wall F and with cross bars H supported on the channel iron beams. The wall F may be handled by a crane and carrying arm as is clearly disclosed in a prior application filed by me on July 7 1919, Serial No. 308,993.

The wall F comprises a frame or support 2, of rectangular form, and refractory material 1, secured thereto along the face exposed to the interior of the furnace, and, as a preference the frame 2 is made hollow as at 4, to receive water, which is circulated therethrough for the purpose of cooling the wall. Inlet and outlet water pipes 9, 10 are shown as entering the hollow of the frame, for circulating water through it.

The frame 2 may be of such length as to extend between and behind two groups of buck stays, if desired, and several of them are used to close the back of the furnace. Around the edge portion of the frame, facing the interior of the furnace is formed a flan e 5, which projects away from the wall 7 of the frame, and the hollow portion or chamber 4 may extend into the flange 5, as shown; at 4. The inner sides 5 of the flange 5 slope outward toward the outer edges 5 of the frame, for the purpose of keying 0r securing the refractory material to the frame. Said refractory material 1 forms a facing for the frame and protects it from the extreme heat in the fur ginal and corner blocks or bricks the entire ther formed with flange portions 6, that' project over the edge or face 5 of the flange 5 and protect it against the heat. At the corners the blocks or bricks 6 have sloping faces on the two sides, 6 6, that engage the two sloping sides of the flange 5 at the corners, and the flange 6 projects away from said two sloping sides to cover the face 5 of the flange 5 at the corners.

With the use of the special form of marinner face of the frame is covered and protected by the facing, and when subjected to the heat of the furnace the blocks or bricks quickly fuse together, thus forming one homogeneous mass keyed or tied to the frame by the inclined or sloping sides of the flange and marginal and corner blocks or bricks.

The hollow frame provides a water jacket for the facing and the water circulating therethrough carries away much of the heat of the furnace absorbed by the facing. In case the facing becomes deteriorated to such an extent that it is useless or in case it crumbles and falls in, the wall may be removed and replaced by a whole one, and a new facing of refractory material built into the frame which was removed.

More or less variation of the exact details of construction is possible without departing from the spirit of this invention; I desire, therefore, not to limit myself to the exact form of the construction shown and described, but intend, in the following claims, to point out all of the invention disclosed herein.

I claim as new, Letters Patent:

1 In a portable back wall for open hearth furnaces, the combination of a frame having a laterally projecting continuous marginal flange portion formed with .backwardly sloping inner sides, and a facing of refractory material supported by said frame and having sloping sides conforming to said sloping sides ofthe flange portion, and projecting edge portions projecting over and covering said flange portion.

2. In a portable back wall for open hearth furnaces, the combination of a rectangular frame having a laterally projecting continuous marginal flange portion formed with backwardly sloping 1nner sides, marginal blocks of refractory material havand desire to secure by ing sloping sides conforming to the sloping inner sides of said flange portion and edge portions projecting over and covering the flange portion of the frame and other blocks of refractory material in the space between said marginal blocks.

8. In a portable back wall for open hearth furnaces, the combination of a frame having a water chamber formed therein and having a laterally projecting continuous marginal flange portion formed with back-' wardly sloping inner sides, and a facing of refractory material supported by said frame and having sloping sides conforming to said sloping sides of the flange portion, and projecting edge portions projecting over and covering said flange portion.

4. In a portable back wall for open hearth furnaces, the combination of a rectangular frame having a water chamber formed therein and having a laterally projecting continuous marginal flange portion formed with backwardly sloping inner sides, marginal blocks of refractory material having sloping sides conforming to the sloping inner sides of said flange portion and edge portions projecting over and covering the flange portion of the frame, and other blocks of refractory material in the space between said marginal blocks.

5. In a portable back wall for open" hearth furnaces, the combination of a frame having a laterally projecting frame like marginal flange, and a facing of refractory material seated in said frame like marginal flange and having a marginal projecting edge portion projecting over said flange.

6. In a portable back wall for open hearth furnaces, the combination of a frame having a laterally projecting frame like marginal flange, marginal blocks ofrefractory material seated within said frame like marginal flange and having marginal projecting edge portions projecting over and covering said flange, and other blocks of refractory material in the space between said marginal blocks.

7 In a portable back wall for open hearth furnaces, the combination of a water jacket having a laterally projecting frame like marginal flange, and a facing of refractory material seated in said frame like marginal flange and having a marginal projecting edge portion projecting over said flange.

8. In a portable back wall for open hearth furnaces, the combination of a water jacket having a laterally projecting frame like marginal flange, marginal blocks of refractory material seated within said frame 9. In a portable back Wall for open 10. In a back wall for open hearth furhearth furnaces, the combination of a frame naces, a block of refractory material having having a frame like marginal flange, and a a side for interlocking engagement with a 10 facing of refractory material having an insupport, and a projecting marginal edge for 5 terlocking engagement with said flange, and covering the interlocking part of said supa projecting marginal edge portion covering port.

said flange. JOHN O. GRIGGS. 

